*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19780
19791
19800
19811
19820
19830
19840
19850
19860
19871
19882
19891
19901
19916
19927
199315
19942
19956
19961
19970
19981
19993
20000
20013
20021
20031
20048
20050
20065
20075
20082
200910
201010
20117
20123
20139
20143
20157
201610
201717
201818
201913
202017
202114
202217
20236
20240
Total235